Wideband Monopole Antenna Feeder Unit Bent Angle
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Solution Overview
Problem
Conventional wideband monopole antennas with Y-type feeder lines are bulky and prone to vibration, leading to variations in radiation characteristics and reduced bandwidth due to the lack of support force and increased size, which complicates integration in portable devices.
Innovation Solution
A wideband monopole antenna design featuring a feeder unit bent at a predetermined angle and made of metallic material to enhance support and reduce size, while maintaining resonance and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Y-type feeder line is used on the rear surface of the substrate, then the antenna can be electrically connected, but the substrate and radiator must be enlarged to accommodate the feeder line, increasing the overall size
Solution Approach 1:
The feeder line is bent at a predetermined angle (e.g., 90 degrees) to change its spatial configuration from a planar layout on the substrate surface to a three-dimensional structure that extends perpendicular to the substrate. This dimensional change allows the feeder line to be routed more efficiently, reducing the area required on the substrate while maintaining electrical connectivity.
2Ease of manufacture
If the feeder line is made of flexible wire, then it can be easily connected, but it has no support force and vibrates severely due to external impact, causing radiation characteristics to vary
Solution Approach 1:
The feeder line is constructed using a composite structure combining flexible wire for electrical connectivity with a rigid metallic support structure (such as a U-shaped bracket or bent metal piece) that provides mechanical strength and vibration resistance. This composite approach allows the feeder to maintain both ease of connection and structural stability under external impacts.
Solution Approach 2:
A metallic support structure acts as an intermediary element between the flexible feeder wire and the substrate/radiator assembly. This intermediary provides the necessary mechanical support and anchoring points, preventing the flexible wire from vibrating excessively while still allowing for easy electrical connection.
3Area of stationary object
If the feeder portion is shortened to reduce the size of the antenna, then the overall antenna size decreases, but the bandwidth decreases
Solution Approach 1:
By bending the feeder line at predetermined angles and extending it in three-dimensional space rather than keeping it planar, the electrical path length is maintained even though the physical footprint on the substrate is reduced. This allows the antenna to achieve compact size while preserving the bandwidth-determining feeder length through spatial configuration rather than linear extension.
Data Source
AI summary
A wideband monopole antenna assembly includes a substrate having an antenna connector, a wideband monopole antenna positioned on the substrate, and a feeder unit positioned on the rear surface of the substrate for supporting the antenna with a part thereof bent at a predetermined angle. The wideband monopole antenna has a feeder portion shorter than conventional antennas for compactness of the antenna.